Cannot be rescinded or changed. An irrevocable trust is a necessity for exempt approval of a group pension scheme.

An agreement which cannot be cancelled unless all the parties concerned agree to do so. For instance, an irrevocable letter of credit, once issued, cannot be amended or cancelled without the agreement of all the named parties. Français: Irrévocable Español: Irrevocable

Unalterable, not to be changed or annulled.

A decision that cannot be changed. An irrevocable gift cannot be taken back once it has been made.

Something that cannot be legally undone, altered, amended, revoked, or terminated.

Cannot be revoked or cancelled without the agreement of all parties to the transaction.

Not able to be undone.

impossible to retract or revoke; "firm and irrevocable is my doom"- Shakespeare